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Surface mounted louvres : United Kingdom

Surface mounted louvres

Pitch Physical free area Visual free area
431, Surface-mounted wall louvre33 45 % 59 %
431R, Round louvre (without frame) 41 % 59 %
432, Surface mounted glazed-in louvre with frame 43 % 59 %
433, Pressure-relief damper 80 % (open) 80 % (open)